Beginners, enthusiasts and hobbyists are all welcomed in our community. Frankly, some of the most active users in our community enjoy reverse engineering as their hobby and this is not their profession. "Researchers" is a term that have more than one definition. As I sees it, people that are trying to reverse engineer a "cheap, china-made, microcontroller board of unknown brand" are considered researchers, even if they don't have tons of experience and a "Researcher" on their shiny tag title.
Reverse-engineering is a broad subject and so can be the questions in our site, as long as they related to RE and considered good questions. When one asks a good question which demonstrates that this person thoroughly searched for an answer before clicking the "Ask" button, we will do our best to help. There are very talented members in our community with vast amount of knowledge about different subjects regarding to RE.
What considered good questions?
The question should be on topic
source: What topics can I ask about here?
If you have a question about ...
- software analysis (static or dynamic)
- disassembly or decompilation
- hardware analysis and testing
- tools commonly used for reverse engineering hardware or software
- deterring reverse engineering efforts
and it is not about ...
- performance evaluation
- performance testing software
- forward engineering (hardware construction, software creation)
- bug hunting (debugging) during software development
Be specific
source: How do I ask a good question?
If you ask a vague question, you’ll get a vague answer. But if you
give us details and context, we can provide a useful answer.
Make it relevant to others
source: How do I ask a good question?
We like to help as many people at a time as we can. Make it clear how
your question is relevant to more people than just you, and more of us
will be interested in your question and willing to look into it.
Regarding your example:
would a question from an hobbyist about reverse engineering the circuit of a cheap, china-made, microcontroller board of unknown brand like those usually found on Amazon or eBay be on-topic here?
Yes, this question would be on-topic as long it is detailed enough and with specific questions.
Here are similar good-questions that created a space for good answers: